Knob attachment.



No. 637,|oo. Patented'nov. |4, |399'.

c. J. Emcsou. KNOB vATTMHMENT.

(Application led June 29, 1899.)

(No Model.)

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' UNITED- STATES PATENQ OFFICE. A

CHARLES JOSEPH ERICSON, OF SALT LAKE CITY, UTAH, ASSIGNOR OF ONE- HALFTO GEORGE G. LINEN, OF NEW YORK, N. Y.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 637,100, dated November14, 1899.

' Application filed im@ 29,1899. serial No. 722,251. (No man.)

T0 all whom, it may concern:

Be it known that I, CHARLES JOSEPH ERIC- sON, of Salt Lake City, in thecounty of Salt Lake and State of Utah, have invented anew and ImprovedKnob Attachment, of which the following is a full, clear, and exactdescription.

The invention relates to door locks and latches; and its object is toprovide a new and improved knob attachment which issimple and durable inconstruction and arranged to securely lock the knob on thescrew-spindle, to perfectly lit any thickness of door, and preventtransverse play of the spindle in the lock.

The invention consists of novel features and parts and combinations ofthesame, as will be fully described hereinafter and then pointed out inthe claim.

A practical embodiment of my invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all 'theviews.

Figure l is a cross-section of a door and door-lock with the improvementapplied. Fig. 2 is a sectional side elevation of the improvement. Fig. 3is a transverse section ofthe same on the line 3 3 in Fig. 2. Fig. 4 isa like view of the same on the line 4 4 in Fig. 2. Fig. 5 is a face Viewof the locking-plate, and Fig. 6 is a side elevation of the improvementas applied to a swivel-spindle.

The spindle A is provided at one end with aflxed outer door-knob B,secured to the spindle in any suitable manner, and on the inner threadedend A of the spindle screws the shank C' of the inner door-knob C. Inorder to lock this door-knob C in position on the spindle A, I provide aclutch having two members D D', of which the member D is secured on orformed integrally with the inner end of the shank C', and the othermember D has a central polygonal opening corresponding to thecross-section of the spindle A to allow of freely sliding the member D'longitudinally on the spindle, but to hold said member from turning on`the spindle.

As shown in the drawings, the clutch member D on the knob is formed withfour radial recesses adapted to be engaged by four projecting ribs onthe other clutch member D', and said ribs and recesses are placed anequal distance apart, as is plainly shown in Figs. 3 and 4, so that aquarter-turn given to the 55 knob C will bring the recesses and ribs inregister with each other. It is evident that when the movable clutchmember D' is in engagement with the other clutch member D on the knobthe latter is held against screw- 6o ing on the spindle in either aninward or outward direction.

In order to lock the movable clutch inember D against sliding on thespindle A after the clutch members are in mesh with each other and afterthe knob C has been screwed up on the spindle A to the desired position,l provide a holdin g-plate E, secured to the door F in the rear of theescutcheon G and abutting against the inner face or back of the 7oclutch member D'. The plate E is preferably in the shape of a fork, asis plainly shown in Fig. 5, so asto straddle the spindle A and allowfree turning thereof to actuate the lock and open or close the door, butprincipally 75 hold the member D' from rearward movement on the spindle.

The door F is formed with a counterbore F', concentric to the spindle A,to allow of sliding the movable clutch member D' inwardly 8o on thespindle A previously to placing the retaining-plate E in position on thedoor F to allow of screwing up the knob C on the threaded end of thespindle A' until the knob is in proper position relatively to thethickness of the door on which the lock is applied.

In using the device the outer escutcheon G' is placed in position on thedoor, and the spindle A, with the knob xed thereon, is placed inposition by being passed from the outer 9o face of the door through theescutcheon and the hub of the lock, and then the knob C is screwed uponthe inner threaded end A of the spindle, the movable clutch member D' onthe spindle being between the two knobs and within the counterbore F' ofthe door.

' The escutcheon G is engaged or hungloosely on the shank C' of theknob, and when the said knob has now been screwed up to its properposition on the spindle A, according roo to the thickness of the door,then the operator, by pushing the knob C against the clutch member D,which is resting against or in the counterbore F', causes the shank ofthe knob C to mesh with the clutch member D, and then the knob is drawnforward, the clutch D being in engagement with the shank C', and theclutch D will follow the knob C until its rear face is moved beyond theface of the door a distance corresponding approximately to the thicknessof the plate E, which is now applied on the door-face to straddle thespindle A and prevent inward sliding of the clutch member D, so that thelatter cannot -get out of engagement with the clutch member D, andconsequently the knob C is prevented from screwing inward or outward onthe spindle A. The plate E is secured in position on the door-face F andthen the es- .outcheon G is fastened in place on the door in the usualmanner to cover up the plate E.

Now it is evident that by the arrangement described the knobs cannot beremoved from the outside of the door when the door is locked, andseparate set-screws or similar fastening devices are entirely dispensedwith for holding the knobs in place.

lVhen the device is used on a swivel-spindle G2, as shown in Fig. 6,then both ends of the spindle are threaded and engaged by knobs H, eachhaving a clutch I for holding the knob from screwing outward on thespindle in the manner above described relatively to the knob C and theclutch having the members D D'. It will be seen that though both knobsare adjustable, when placed in position on the door the outside knobcannot be taken O, as it is secured in exactly the same manner as thesolid spindle, where only one knob is adjustable.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- In a knob attachment, the combination with aspindle, the knob screwing thereon and having its shank formed with afixed clutch member, and an opposing clutch member movablelongitudinally on the spindle but held from turning thereon, of theforked plate E, arranged to straddle the spindle in rear of the movableclutch member and to be secured directly to the door in rear of theescutcheon, the members of the fork of the plate being of a lengthgreater than the diameter of the movable clutch member, whereby theplate alone holds the movable clutch member from rearward movement,thereby enabling the fastening to be used With any style of escutcheon,substantially as described.

CHARLES JOSEPH ERICSON.

Witnesses:

GEO. MASON, CHAs. D. SAVERY.

